SVG: Items inserted into list should be made a tear-off.

Source/core/svg/properties/SVGListPropertyTearOffHelper.h

Index: Source/core/svg/properties/SVGListPropertyTearOffHelper.h
diff --git a/Source/core/svg/properties/SVGListPropertyTearOffHelper.h b/Source/core/svg/properties/SVGListPropertyTearOffHelper.h
index 8c6e6bc81e676b26367957a791e23304dfdd93b5..a10e454957a4381f0bf0be69a1c43f2498604568 100644
--- a/Source/core/svg/properties/SVGListPropertyTearOffHelper.h
+++ b/Source/core/svg/properties/SVGListPropertyTearOffHelper.h
@@ -44,7 +44,7 @@ public:
     typedef ItemProperty ItemPropertyType;
     typedef typename ItemPropertyType::TearOffType ItemTearOffType;
 
-    static PassRefPtr<ItemPropertyType> getValueForInsertionFromTearOff(PassRefPtr<ItemTearOffType> passNewItem)
+    static PassRefPtr<ItemPropertyType> getValueForInsertionFromTearOff(PassRefPtr<ItemTearOffType> passNewItem, SVGElement* contextElement, const QualifiedName& attributeName)
     {
         RefPtr<ItemTearOffType> newItem = passNewItem;
 
@@ -61,6 +61,7 @@ public:
             return newItem->target()->clone();
         }
 
+        newItem->makeTearOff(contextElement, attributeName);
         return newItem->target();
     }
 
@@ -202,9 +203,9 @@ protected:
     {
     }
 
-    static PassRefPtr<ItemPropertyType> getValueForInsertionFromTearOff(PassRefPtr<ItemTearOffType> passNewItem)
+    PassRefPtr<ItemPropertyType> getValueForInsertionFromTearOff(PassRefPtr<ItemTearOffType> passNewItem)
     {
-        return ItemTraits::getValueForInsertionFromTearOff(passNewItem);
+        return ItemTraits::getValueForInsertionFromTearOff(passNewItem, toDerived()->contextElement(), toDerived()->attributeName());
     }
 
     PassRefPtr<ItemTearOffType> createItemTearOff(PassRefPtr<ItemPropertyType> value)